JP2008113224A - Communication controller, wireless communication apparatus, communication control method and wireless communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication controller which can always transmit a transmission band control message Msg indicative of the narrowing of a transmission band in a minimum arriving time to the transmission side when communication is performed while complementing a band deficient in one wireless communication route by using the other wireless communication route, and to provide a wireless communication apparatus, a communication control method and a wireless communication method. <P>SOLUTION: The communication controller comprises means (109, 309) for generating transmission band control information indicative of the narrowing of a transmission band based on a packet received via one wireless communication route 10A, means (109, 309) for generating transmission band control information indicative of the narrowing of the transmission band based on a packet received via the other wireless communication route 10B, and control means (115, 315) each selecting an optimal delivery route of transmission band control information thus generated based on band states of a plurality of wireless communication routes. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, a plurality of different wireless communication paths can be used, and the bandwidth that is lacking in one wireless communication path is supplemented by using other wireless communication paths with respect to the required bandwidth of the application having real-time characteristics to be used. The present invention relates to a novel communication control device, a wireless communication device, a communication control method, and a wireless communication method capable of executing communication.

  For example, in a wireless communication network using an Internet protocol (IP) group (hereinafter, appropriately abbreviated as “wireless IP network”), so-called mobile IP is defined in order to improve mobility of a wireless communication device (for example, Non-patent document 1).

In the mobile IP, a care-of IP address (Care of Address) that is dynamically assigned according to the position of the wireless communication device is used.
C. Perkins, “IP Mobility Support (RFC2002)”, [online], October 1996, IETF, [March 15, 2006 search], Internet <URL: http: //www.ietf.org / rfc /rfc2002.txt

  By the way, recently, an environment in which a wireless communication apparatus can use a plurality of wireless IP networks (for example, a mobile phone network and a wireless LAN network) is being provided.

  If such an environment is provided, when the bandwidth of the wireless IP network used for ongoing communication is insufficient, a plurality of wireless IPs such that the insufficient bandwidth is supplemented by another wireless IP network. It is conceivable to use the network simultaneously.

  However, when one wireless IP network is used as a master route, another wireless IP network is used as a slave route, and the bandwidth that is insufficient in the master route is supplemented by the slave route, the allowable bandwidth in the slave route satisfies the bandwidth that needs to be supplemented. Otherwise, the packets corresponding to the supplementary bandwidth to be transmitted to the slave path are temporarily stored in a buffer existing on the path and sequentially transmitted because the bandwidth is insufficient. For this reason, on the receiving side, a delay occurs between the packet received via the master path and the packet received via the slave path. This delay appears as an overtaking of SN (sequence number) in VoIP packets.

  In real-time applications such as VoIP, a jitter buffer is provided in order to absorb the overtaking of packets in the network. However, when the delay between paths increases and exceeds the buffer capacity of the jitter buffer, the delay exceeds the capacity. Even if the packet is received, it is discarded. For this reason, if the transmission of packets exceeding the allowable bandwidth is continued, the amount of packets accumulated in the buffer existing on the path will increase (up to the limit amount of the buffer), resulting in a delay difference corresponding to the accumulation amount. Eventually, all the packets sent out as a complement will be discarded at the receiving end.

  Particularly in wireless communication paths, the allowable bandwidth depends on changes in the propagation environment such as fading, so even if the allowable bandwidth of the slave path is sufficient at the beginning of communication, the bandwidth becomes narrow due to subsequent deterioration of the propagation environment. The above phenomenon tends to occur. As a method for avoiding this, for example, based on the received packet in the slave path, when the fluctuation of the allowable bandwidth of the slave path, in particular, the narrowing of the band is accurately detected, and when the narrowing of the band is detected, It is conceivable to transmit a transmission band control message indicating that fact (hereinafter, the message is abbreviated as Msg as appropriate) to the packet transmission side so as to avoid complementation beyond the allowable band.

  Since the fluctuation of the allowable bandwidth also occurs on the master route side, the narrow bandwidth of the master route is detected based on the received packet in the master route as well, and the transmission bandwidth control Msg indicating the narrow bandwidth is packetized. It is conceivable to transmit to the transmission side so as to avoid transmission exceeding the allowable bandwidth.

  However, in this case, if the transmission bandwidth control Msg is transmitted to the packet transmission side from the narrow-band wireless communication path to be controlled, the arrival of the transmission bandwidth control Msg itself to the packet transmission side is delayed. Due to the delay, the stay in the packet transmission path increases, that is, the delay time increases, and a longer time is required to eliminate the stay.

  It is also conceivable that the transmission band control Msg is transmitted to the packet transmission side from another wireless communication path different from the control target wireless communication path. In this case, however, the allowable bandwidth of the other wireless communication path is narrow. If this happens, the same problem will occur.

  Accordingly, an object of the present invention made in view of such circumstances is that a plurality of different wireless communication paths can be used, and communication can be performed while supplementing the bandwidth shortage in one wireless communication path using another wireless communication path. In execution, the transmission bandwidth control Msg indicating the narrowing of the transmission bandwidth to the packet transmission side can always be transmitted with the minimum arrival time, and packet retention in the wireless communication path can be minimized. A communication control device, a wireless communication device, a communication control method, and a wireless communication method are provided.

The invention according to claim 1, which achieves the above object, allows a plurality of different wireless communication paths to be used with a wireless communication apparatus, and provides one wireless communication path for a requested bandwidth of an application having real-time characteristics to be used. A communication control device for controlling the communication between the wireless communication device and the communication destination by supplementing the insufficient bandwidth with another wireless communication path,
Based on a packet received via the one wireless communication path, first uplink transmission band control information indicating narrowing of a transmission band of a packet transmitted from the wireless communication apparatus to the one wireless communication path is generated. 1 uplink transmission band control information generating means;
Based on a packet received via the other wireless communication path, second uplink transmission band control information indicating the narrowing of the transmission band of the packet transmitted from the wireless communication apparatus to the other wireless communication path is generated. 2 uplink transmission band control information generating means;
An uplink for selecting an optimum transmission path for transmitting the first uplink transmission band control information or the second uplink transmission band control information to the radio communication device based on the band states of the plurality of radio communication paths Direction transmission bandwidth control information transmission path control means;
It is characterized by having.

  The invention according to claim 2 is the communication control apparatus according to claim 1, wherein the uplink transmission band control information transmission path control means includes the first radio communication path and the other radio communication path. A wireless communication path that has not transmitted one uplink transmission band control information or the second uplink transmission band control information for a certain period is selected as an optimum transmission path.

  According to a third aspect of the present invention, in the communication control device according to the first or second aspect, the uplink transmission band control information transmission path control means includes the one radio communication path and the other radio communication path. A wireless communication path having a maximum allowable bandwidth is selected as an optimum transmission path of the first uplink transmission band control information or the second uplink transmission band control information.

  According to a fourth aspect of the present invention, in the communication control device according to the first aspect, the uplink transmission band control information transmission path control means includes the wireless communication path of the one wireless communication path and the other wireless communication path. The wireless communication path with the shortest retention cancellation time of the transmission packet from the communication device is selected as the optimal transmission path of the first uplink transmission band control information or the second uplink transmission band control information. Is.

Furthermore, in the invention according to claim 5 that achieves the above object, a plurality of different wireless communication paths can be used with the communication control apparatus, and one wireless is provided for a requested bandwidth of an application having real-time characteristics to be used. A wireless communication device that complements a bandwidth shortage in a communication path using another wireless communication route and wirelessly communicates with a communication destination via the communication control device,
Based on a packet received via the one wireless communication path, first downlink transmission band control information indicating narrowing of a transmission band of a packet transmitted from the communication control device to the one wireless communication path is generated. 1 downlink transmission band control information generating means;
Generating second downlink transmission band control information indicating narrowing of the transmission band of a packet transmitted from the communication control device to the other wireless communication path based on a packet received via the other wireless communication path; 2 downlink transmission band control information generating means;
A downlink that selects an optimum transmission path for transmitting the first downlink transmission band control information or the second downlink transmission band control information to the communication control device based on the band state of the plurality of wireless communication paths. Direction transmission bandwidth control information transmission path control means;
It is characterized by having.

  The invention according to claim 6 is the wireless communication apparatus according to claim 5, wherein the downlink transmission band control information transmission path control means includes the first wireless communication path and the other wireless communication path. A wireless communication path that has not transmitted one downlink transmission band control information or the second downlink transmission band control information for a certain period is selected as an optimum transmission path.

  The invention according to claim 7 is the wireless communication apparatus according to claim 5 or 6, wherein the downlink transmission band control information transmission route control means includes the one wireless communication route and the other wireless communication route. The wireless communication path having the maximum allowable bandwidth is selected as an optimum transmission path of the first downlink transmission band control information or the second downlink transmission band control information.

  The invention according to claim 8 is the wireless communication apparatus according to claim 5, wherein the downlink transmission band control information transmission route control means is the communication among the one wireless communication route and the other wireless communication route. The wireless communication path having the shortest retention cancellation time of the transmission packet from the control device is selected as the optimal transmission path of the first downlink transmission band control information or the second downlink transmission band control information. Is.

Furthermore, in the invention according to claim 9 which achieves the above object, a plurality of different wireless communication paths can be used with a wireless communication apparatus, and a single wireless is provided for a requested bandwidth of an application having real-time characteristics to be used. A communication control method for controlling communication between the wireless communication apparatus and a communication destination by supplementing a bandwidth that is insufficient in a communication path with another wireless communication path,
Generating first uplink transmission band control information indicating narrowing of a transmission band of a packet transmitted from the wireless communication apparatus to the one wireless communication path based on a packet received via the one wireless communication path; When,
Generating second uplink transmission band control information indicating narrowing of a transmission band of a packet transmitted from the wireless communication apparatus to the other wireless communication path based on a packet received via the other wireless communication path; When,
Selecting an optimum transmission path for transmitting the first uplink transmission band control information or the second uplink transmission band control information to the radio communication apparatus based on the band states of the plurality of radio communication paths. When,
It is characterized by including.

Furthermore, in the invention according to claim 10 that achieves the above object, a plurality of different wireless communication paths can be used with the communication control apparatus, and one wireless is provided for a required bandwidth of an application having real-time characteristics to be used. A wireless communication method for complementing a bandwidth shortage in a communication path using another wireless communication path and wirelessly communicating with a communication destination via the communication control device,
Generating first downlink transmission band control information indicating narrowing of a transmission band of a packet transmitted from the communication control apparatus to the one wireless communication path based on a packet received via the one wireless communication path; When,
Generating second downlink transmission band control information indicating narrowing of a transmission band of a packet transmitted from the communication control device to the other wireless communication path based on a packet received via the other wireless communication path When,
Selecting an optimal transmission path for transmitting the first downlink transmission band control information or the second downlink transmission band control information to the communication control device based on a band state of the plurality of wireless communication paths. When,
It is characterized by including.

  According to the present invention, when a plurality of different wireless communication paths are used at the same time, and the communication is performed by supplementing the bandwidth shortage in one wireless communication path with another wireless communication path, Based on the bandwidth state, the optimum transmission path for transmitting the transmission bandwidth control Msg indicating the narrowing of the transmission bandwidth to the packet transmission side is selected, so that the transmission bandwidth control Msg is always transmitted with the minimum arrival time. It is possible to provide a communication control device, a wireless communication device, a communication control method, and a wireless communication method that can be transmitted to the wireless communication path and can minimize packet retention in the wireless communication path.

  Next, an embodiment of the present invention will be described with reference to the drawings.

(Overall schematic configuration of communication system)
FIG. 1 is an overall schematic configuration diagram of a communication system 1 according to the present embodiment. As shown in FIG. 1, the communication system 1 includes a wireless IP network 10A and a wireless IP network 10B. The wireless IP network 10A is an IP network that can transmit IP packets. In the wireless IP network 10A, the care-of IP address A1 is dynamically assigned to the MN 300 in accordance with the position of the wireless communication device 300 (hereinafter abbreviated as MN 300). In the present embodiment, the wireless IP network 10A is a mobile phone network that uses CDMA (specifically, HRPD, which is a 3GPP2 standard) as a wireless communication method.

  The wireless IP network 10B can transmit IP packets in the same manner as the wireless IP network 10A. In the wireless IP network 10B, the care-of IP address A2 is assigned to the MN 300. In the present embodiment, the wireless IP network 10B uses mobile WiMAX compliant with the IEEE 802.16e standard as a wireless communication method.

  The care-of IP address A1 is given from the wireless IP network 10A when the MN 300 is connected to the wireless IP network 10A. Similarly, the care-of IP address A2 is given from the wireless IP network 10B when the MN 300 is connected to the wireless IP network 10B.

  In this embodiment, care-of IP address A1 and care-of IP address A2 are associated with home IP address AH (virtual address).

  The switching server 100 and the MN 300 can execute communication using the wireless IP network 10A and the wireless IP network 10B simultaneously. Specifically, the switching server 100 and the MN 300 perform transmission and reception of IP packets using the wireless IP network 10A as a master route, and when the bandwidth (transfer rate) of the master route is insufficient, the switching server 100 and the MN 300 Using as a path, the insufficient band is complemented by a slave path. Note that the slave path is not limited to one of the wireless IP networks 10B, and a plurality of available wireless IP networks may be used simultaneously.

  The wireless IP network 10A and the wireless IP network 10B are connected to the Internet 20. The switching server 100 is connected to the Internet 20. The switching server 100 constitutes a communication control device that controls a wireless communication path with the MN 300, and can transmit an IP packet to the MN 300 via the wireless IP network 10A and also via the wireless IP network 10B. Thus, an IP packet can be transmitted to the MN 300.

  The switching server 100 has a VPN router function for performing routing processing of IP packets, and by establishing a tunnel by VPN (IPSec) between the MN 300 and the switching server 100, virtualization of the OSI third layer To secure the IP mobility of the MN 300.

  That is, in the present embodiment, unlike mobile IP (for example, RFC2002), the MN 300 has a master route set via the wireless IP network 10A and a slave route set via the wireless IP network 10B. The communication with the communication destination (specifically, the IP telephone terminal 40) can be executed using both wireless communication paths simultaneously.

  The switching server 100 is connected to the IP telephone terminal 40 via a communication network 10 </ b> C connected to the Internet 20. The IP telephone terminal 40 mutually converts voice signals and VoIP packets, and transmits / receives IP packets.

  Specifically, the switching server 100 (communication control device) receives an IP packet (VoIP packet) transmitted from the MN 300 (wireless communication device) to the IP telephone terminal 40 (communication destination) at a predetermined cycle (20 ms). Then, the IP phone terminal 40 receives the IP packet (VoIP packet) transmitted from the IP phone terminal 40 to the MN 300 at a predetermined cycle (20 ms) and relays it to the MN 300.

  Next, the functional block configuration of the communication system 1 will be described. Specifically, the functional block configurations of the switching server 100 and the MN 300 included in the communication system 1 will be described with reference to FIG. Hereinafter, portions related to the present invention will be mainly described. Therefore, it should be noted that the switching server 100 and the MN 300 may include a logic block (a power supply unit or the like) that is not shown in the drawing or that is omitted in description in order to realize the function as the device.

(Switching server 100)
As shown in FIG. 2, the switching server 100 includes a reception interface unit (I / F A) 101Rx, a reception interface unit (I / F B) 103Rx, a reception interface unit (I / FC) 105Rx, and a transmission interface unit (I / F A) 101Tx, transmission interface unit (I / F B) 103Tx, transmission interface unit (I / FC) 105Tx, received packet monitoring unit 107, transmission band calculation unit 109, transmission band control Msg analysis unit 111, packet transmission A route control unit 113, a control Msg transmission route control unit 115, and a transmission route selection unit 117 are provided.

  The reception interface unit 101Rx and the transmission interface unit 101Tx constitute a communication interface unit corresponding to the wireless IP network 10A. For example, the reception interface unit 101Rx and the transmission interface unit 101Tx are configured by 1000BASE-T defined by IEEE 802.3ab, connected to the Internet 20, and It is connected to the network 10A.

  Similarly, the reception interface unit 103Rx and the transmission interface unit 103Tx constitute a communication interface unit corresponding to the wireless IP network 10B. For example, the reception interface unit 103Rx and the transmission interface unit 103Tx are configured by 1000BASE-T defined by IEEE 802.3ab and connected to the Internet 20. Are connected to the wireless IP network 10B.

  In this embodiment, since IPSec VPN is set as described above, IP packets transmitted and received by the communication interface units respectively corresponding to the wireless IP network 10A and the wireless IP network 10B, specifically, the switching server 100 A VoIP packet (specifically, a VoIP packet transmitted by the MN 300) transmitted and received between the MN 300 and the MN 300 has a configuration shown in FIG. That is, a VoIP packet encapsulates a home IP header (home IP address AH), a TCP / UDP header, and a payload, and a care-of IP address (care-of IP address A1 or care-of IP address A2) is added.

  The access control packet transmitted / received between the switching server 100 and the MN 300 has the configuration shown in FIG. That is, the access control packet includes a data link layer header, a care-of IP address, a TCP header, and a control code.

  The reception interface unit 105Rx and the transmission interface unit 105Tx constitute a communication interface unit corresponding to the communication network 10C, and are connected to the Internet 20 and used for communication with the IP telephone terminal 40.

  The received packet monitoring means 107 has a jitter buffer that absorbs the jitter of the IP packet received by the reception interface unit 101Rx and the reception interface unit 103Rx, and sends the received IP packet to the IP telephone terminal 40 via the transmission interface unit 105Tx. Send. The reception packet monitoring unit 107 supplies the IP packet received by the reception interface unit 101Rx and the reception interface unit 103Rx to the transmission band calculation unit 109, and the first downlink transmission band control Msg (described later) from the MN 300 and 2 The downlink transmission band control Msg is received and supplied to the transmission band control Msg analyzing means 111.

  The transmission bandwidth calculation unit 109 is configured to output the first IP packet sent from the MN 300 to the wireless IP network 10A based on the received packet from the reception packet monitoring unit 107 via the wireless IP network 10A at a predetermined period (eg, 1000 ms). When one uplink transmission band is calculated and the calculated current first uplink transmission band is narrower than the first uplink transmission band calculated immediately before, the first uplink transmission band calculated at the present time The direction transmission band is supplied to the control Msg transmission path control means 115 and also supplied to the transmission path selection means 117 as the first uplink transmission band control Msg indicating the narrowing of the transmission band.

  Similarly, the transmission band calculation means 109, based on the received packets from the received packet monitoring means 107 via the wireless IP network 10B, in the same way, the IP packets sent by the MN 300 to the wireless IP network 10B at a predetermined cycle. When the second uplink transmission band is calculated and the calculated current second uplink transmission band is narrower than the previously calculated second uplink transmission band, the second calculated at the present time The uplink transmission band is supplied to the control Msg transmission path control means 115 and also supplied to the transmission path selection means 117 as the second uplink transmission band control Msg indicating the narrowing of the transmission band.

  Therefore, in the present embodiment, transmission band calculation means 109 constitutes first uplink transmission band control information generation means and second uplink transmission band control information generation means.

  In calculating the transmission band based on the received packet in the transmission band calculating unit 109, for example, the received packet in the monitoring period Tchk is counted for each route of the wireless IP network 10A and the wireless IP network 10B. The transmission bandwidth is calculated based on the number of received packets (reception rate). In this case, the monitoring period Tchk can be fixed (for example, 500 ms), or the next monitoring period Tchk can be shortened as the transmission band is larger, depending on the calculated transmission band.

  The transmission band control Msg analyzing unit 111 is configured so that the switching server 100 performs wireless IP based on a first downlink transmission band control Msg and a second downlink transmission band control Msg described later from the MN 300 received from the received packet monitoring unit 107. The first downstream transmission band of the IP packet transmitted to the network 10A and the second downstream transmission band of the IP packet transmitted by the switching server 100 to the wireless IP network 10B are analyzed, and the analysis result is transmitted as a packet. This is supplied to the route control means 113 and the control Msg transmission route control means 115.

  The packet transmission path control unit 113 controls the transmission path selection unit 117 based on the first downlink transmission band and the second downlink transmission band analyzed by the transmission band control Msg analysis unit 111.

  As a result, the transmission path selection unit 117 receives the VoIP packet from the IP telephone terminal 40 received via the reception interface unit 105Rx, and the first downlink transmission band and the second downlink direction analyzed by the transmission band control Msg analysis unit 111. Depending on the transmission band, the transmission interface unit 101Tx and the transmission interface unit 103Tx are assigned to each other and transmitted to the MN 300 via the wireless IP network 10A and the wireless IP network 10B. The transmission path selection means 117 has a jitter buffer that absorbs the jitter of the IP packet received by the reception interface unit 105Rx.

  Specifically, the transmission path selection unit 117 converts the IP packet including the home IP address AH received from the IP telephone terminal 40 based on the information of the first downlink transmission band received from the transmission band control Msg analysis unit 111. Then, the care-of IP address A1 is added, and the IP packet to which the care-of IP address A1 is added is transmitted from the transmission interface unit 101Tx to the wireless IP network 10A.

  Further, the transmission path selection unit 117 takes care of the IP packet including the home IP address AH received from the IP telephone terminal 40 based on the information of the second downlink transmission band received from the transmission band control Msg analysis unit 111. The address A2 is added, and the IP packet with the care-of IP address A2 added is transmitted from the transmission interface unit 103Tx to the wireless IP network 10B.

  The control Msg transmission path control unit 115 includes the first uplink transmission band and the second uplink transmission band supplied from the transmission band calculation unit 109, and the first downlink transmission band analyzed by the transmission band control Msg analysis unit 111. And the second downlink transmission band, the bandwidth state of the wireless IP network 10A and the wireless IP network 10B is managed, and the transmission route selection means 117 is controlled based on the bandwidth state, and the transmission band calculation means 109 The optimum transmission path to the MN 300 of the first uplink transmission band control Msg and the second uplink transmission band control Msg generated in step S2 is selected. The first uplink transmission band control Msg and the second uplink transmission band control Msg are transmitted and received using access control packets (see FIG. 3B), respectively.

  Therefore, in this embodiment, the control Msg transmission path control means 115 constitutes an upstream transmission band control information transmission path control means. The specific selection process of the transmission path of the first uplink transmission band control Msg and the second uplink transmission band control Msg by the control Msg transmission path control means 115 will be described later.

  In addition to the above functions, the switching server 100 according to the present embodiment has an order of IP packets transmitted and received between the MN 300 and the IP telephone terminal 40 via the wireless IP network 10A and the wireless IP network 10B. Is also checked using a sequence number (SN) of RTP (real-time transport protocol) included in the VoIP packet. The switching server 100 also has a function of acquiring statistical information (for example, packet loss, throughput, jitter buffer underrun count and overrun count) of the relayed IP packet and transmitting the acquired information to the MN 300. Yes.

  Further, the switching server 100 includes a home IP address AH included in the IP packet transmitted by the IP telephone terminal 40 and a home IP address registered in a home agent (not shown) accessible via the Internet 20. It has a function of collating, so that it is possible to determine which home IP address AH is the home IP address assigned to the MN 300 by which carrier.

(MN300)
Similar to the switching server 100, the MN 300 can execute communication using the wireless IP network 10A and the wireless IP network 10B simultaneously. Hereinafter, description of functional blocks similar to those of the switching server 100 described above will be omitted as appropriate.

  As shown in FIG. 2, the MN 300 includes a reception interface unit (I / F A) 301Rx, a reception interface unit (I / F B) 303Rx, a transmission interface unit (I / F A) 301Tx, and a transmission interface unit (I / F). B) 303Tx, application (application) processing means 305, received packet monitoring means 307, transmission bandwidth calculation means 309, transmission bandwidth control Msg analysis means 311, packet transmission path control means 313, control Msg transmission path control means 315, transmission path selection Means 317 are included.

  The reception interface unit 301Rx and the transmission interface unit 301Tx perform wireless communication of a wireless communication method (HRPD that is a 3GPP2 standard) used in the wireless IP network 10A. In the present embodiment, IP packets (VoIP packets) are transmitted / received to / from the IP telephone terminal 40 via the wireless IP network 10A at a predetermined cycle (for example, 20 ms). The reception interface unit 301Rx and the transmission interface unit 301Tx are built in the MN 300 or configured by a wireless communication card.

  The reception interface unit 303Rx and the transmission interface unit 303Tx execute wireless communication conforming to the wireless communication method (mobile WiMAX) used in the wireless IP network 10B, and are similarly incorporated in the MN 300 or a wireless communication card. Consists of.

  The reception interface unit 301Rx and the transmission interface unit 301Tx, and the reception interface unit 303Rx and the transmission interface unit 303Tx are based on the care-of IP address A1 and the care-of IP address A2 assigned to the MN 300 in the radio IP network 10A and the radio IP network 10B. To send and receive IP packets.

  The received packet monitoring unit 307 has a jitter buffer that absorbs jitter of the IP packet received by the reception interface unit 301Rx and the reception interface unit 303Rx, and supplies the received IP packet to the application processing control 305. The reception packet monitoring unit 307 supplies the IP packet received by the reception interface unit 301Rx and the reception interface unit 303Rx to the transmission band calculation unit 309, and the above-described first uplink transmission band control Msg from the switching server 100. The second upstream transmission band control Msg is received and supplied to the transmission band control Msg analyzing means 311.

  The application processing unit 305 processes the received IP packet from the received packet monitoring unit 307 according to the application, generates an IP packet (for example, a VoIP packet) according to the application, and sends it to the transmission path selection unit 317. Note that the application processing unit 305 stores the home IP address AH of the MN 300 associated with the care-of IP address A1 and the care-of IP address A2.

  Similar to the transmission band calculation unit 109 of the switching server 100, the transmission band calculation unit 309 is based on the received packet from the reception packet monitoring unit 307 via the wireless IP network 10A at a predetermined period (for example, 1000 ms). The switching server 100 calculates the first downlink transmission band of the IP packet transmitted to the wireless IP network 10A, and the calculated current first downlink transmission band is narrower than the first downlink transmission band calculated immediately before. In the case of banding, the first downlink transmission band calculated at the present time is supplied to the control Msg transmission path control means 315 and transmitted as the first downlink transmission band control Msg indicating the narrowing of the transmission band. This is supplied to the route selection means 317.

  Similarly, the transmission bandwidth calculation unit 309 is configured to receive the IP sent from the switching server 100 to the wireless IP network 10B in a predetermined cycle based on the received packet from the received packet monitoring unit 307 via the wireless IP network 10B. The second downlink transmission band of the packet is calculated, and when the calculated second downlink transmission band at the present time is narrower than the second downlink transmission band calculated immediately before, it is calculated at the present time. The second downlink transmission band is supplied to the control Msg transmission path control means 315 and also supplied to the transmission path selection means 317 as the second downlink transmission band control Msg indicating the narrowing of the transmission band.

  Therefore, in the present embodiment, the transmission band calculation means 309 constitutes a first downlink transmission band control information generation means and a second downlink transmission band control information generation means.

  In the transmission band calculation unit 309, when the transmission band is calculated based on the received packet, for example, each of the wireless IP network 10A and the wireless IP network 10B is similar to the transmission band calculation unit 109 of the switching server 100 described above. For the path, the number of received packets in the monitoring period Tchk is counted, and the transmission bandwidth is calculated based on the number of received packets (reception rate).

  The transmission band control Msg analyzing unit 311 is configured so that the MN 300 performs wireless IP based on the above-described first uplink transmission band control Msg and second uplink transmission band control Msg received from the received packet monitoring unit 307. The first upstream transmission band of the IP packet transmitted to the network 10A and the second upstream transmission band of the IP packet transmitted from the MN 300 to the wireless IP network 10B are analyzed, and the analysis result is subjected to packet transmission path control. This is supplied to the means 313 and the control Msg transmission path control means 315.

  The packet transmission path control unit 313 controls the transmission path selection unit 317 based on the first uplink transmission band and the second uplink transmission band analyzed by the transmission band control Msg analysis unit 311.

  As a result, the transmission path selection unit 317 transmits the VoIP packet from the application processing unit 305 according to the first uplink transmission band and the second uplink transmission band analyzed by the transmission band control Msg analysis unit 311. The information is distributed to the unit 301Tx and the transmission interface unit 303Tx and transmitted to the switching server 100 via the wireless IP network 10A and the wireless IP network 10B.

  Specifically, the transmission path selection unit 317 generates an IP packet including the home IP address AH from the application processing unit 305 based on the information on the first upstream transmission band received from the transmission band control Msg analysis unit 311. The care-of IP address A1 is added, and the IP packet with the care-of IP address A1 added is transmitted from the transmission interface unit 301Tx to the wireless IP network 10A.

  Also, the transmission path selection unit 317 takes care of the IP packet including the home IP address AH from the application processing unit 305 based on the information on the second upstream transmission band received from the transmission band control Msg analysis unit 311. A2 is added, and the IP packet to which the care-of IP address A2 is added is transmitted from the transmission interface unit 303Tx to the wireless IP network 10B.

  The control Msg transmission path control unit 315 includes the first downlink transmission band and the second downlink transmission band supplied from the transmission band calculation unit 309, and the first uplink transmission band analyzed by the transmission band control Msg analysis unit 311. And the bandwidth state of the wireless IP network 10A and the wireless IP network 10B based on the second upstream transmission band, and the transmission path selection unit 317 is controlled based on the bandwidth state to transmit the bandwidth calculation unit 309. The transmission route to the switching server 100 of the first downlink transmission band control Msg and the second downlink transmission band control Msg generated in step S1 is selected. The first downlink transmission band control Msg and the second downlink transmission band control Msg are similar to the above-described first uplink transmission band control Msg and second uplink transmission band control Msg, respectively. Transmission / reception is performed using FIG.

  Therefore, in this embodiment, the control Msg transmission path control means 315 constitutes a downlink transmission band control information transmission path control means. The specific selection process of the transmission path of the first downlink transmission band control Msg and the second downlink transmission band control Msg by the control Msg transmission path control means 315 will be described later.

  Note that the MN 300 according to the present embodiment checks the order of IP packets transmitted / received to / from the IP telephone terminal 40 using the RTP sequence number (SN) included in the VoIP packet, similarly to the switching server 100. It also has a function to do.

(Transmission route control Msg transmission route selection process)
Next, the transmission route selection processing of the first uplink transmission band control Msg and the second uplink transmission band control Msg by the control Msg transmission route control means 115 of the switching server 100 described above, and the control Msg transmission route control of the MN 300 A transmission route selection process of the first downlink transmission band control Msg and the second downlink transmission band control Msg by the means 315 will be described. Since the transmission route selection processing of these transmission bandwidth control Msg is the same on the switching server 100 side and the MN 300 side, here, the case where the switching server 100 sends the transmission bandwidth control Msg to the MN 300 will be described as a representative.

  FIG. 4 is a flowchart showing a route selection process of the transmission bandwidth control Msg. First, the priority order of the wireless communication paths in use is set, and the bandwidth state is verified by sorting the paths in the priority order (step S1).

  In this route verification, first, it is determined whether or not the route to be verified (L) is a route (Lobj) to be controlled by the transmission bandwidth control Msg (step S2). (Step S3), the next route is verified. On the other hand, if the route is not controlled, it is determined whether or not the transmission bandwidth has been updated by narrowing the bandwidth in a predetermined period (Tth: 1000 ms, for example) up to the present time (step S4). If so, it is excluded from the transmission candidates (step S5), and the next route is verified. Here, the determination in step S4 can be determined from the history of the transmission bandwidth control Msg in the corresponding route, for example.

  In step S4, if the transmission band is not updated due to the narrowing of bandwidth for a predetermined period (Tth) up to the present time, then within a certain period up to the present time (for example, several seconds), the MN 300 It is determined whether or not there is a change in the narrowed transmission band designated by the transmission band control Msg from (step S6).

  Here, if there is no change, the allowable bandwidth of the route is equal to or greater than the transmission bandwidth at least for a certain period immediately before, so this route can be used as the transmission route of the transmission bandwidth control Msg without verifying the subsequent route. As (Lmsg) (step S7), the transmission path selection means 117 is controlled, thereby transmitting the transmission bandwidth control Msg from the transmission path (Lmsg) (step S8), and the process is terminated.

  On the other hand, if there is a change in the transmission band instructed by the transmission band control Msg from the MN 300 in step S6, it is next determined whether or not the change is an instruction to intermittently narrow the band. (Step S9). As a result, if it is an instruction to intermittently narrow the bandwidth, there is a possibility that packet retention or the like has occurred in the route, so it is excluded from the transmission candidates (step S10), and the next route is Validate. On the other hand, if it is not an instruction to intermittently narrow the bandwidth, the lowest transmission bandwidth (Bmin (L)) in the route within the certain period is acquired as a transmission candidate (step S11), and the next Validate the route.

  If the route (Lmsg) for sending the transmission bandwidth control Msg is not obtained as a result of verification for all routes, next, the presence / absence of a candidate route is determined (step S12). As a result, if there is a candidate, the route having the highest value among the minimum transmission bandwidths (Bmin (L)) of the candidate route is set as the transmission route (Lmsg) of the transmission bandwidth control Msg (step S13). In step S8, the transmission bandwidth control Msg is transmitted from the transmission path (Lmsg), and the process is terminated.

  On the other hand, if no candidate route is obtained in step S12, the time (Tsty (L)) required for eliminating packet retention in the route according to the priorities for all routes is obtained. Estimate (step S14), the route with the shortest elimination time (Tsty (L)) is set as the transmission route (Lmsg) of the transmission bandwidth control Msg (step S15), and the transmission bandwidth control Msg from the transmission route (Lmsg) in step S8. Is sent to finish the process.

Note that the stay elimination time (Tsty (L)) obtained in step S14 is estimated based on, for example, fluctuations in the transmission band instructed by the transmission band control Msg from the MN 300. That is, as shown in FIG. 5, the relationship between the reception time of the packet before narrowing the band and the sequence number (SN) is
SN = tan (θ) × t
It is represented by a straight line. Here, θ represents the slope of the straight line, and t represents the time. Also, the relationship between the packet transmission time and SN on the transmission side is:
SN = tan (θ) × t + Sdly
It is represented by a straight line. Here, Sdly is a value that depends on the characteristics of the route, which is an opening of SN caused by a delay in the route.

  In FIG. 5, it is assumed that the bandwidth of the route changes from the bandwidth B1 to the bandwidth B2 at time t1. In this case, if the transmission band is calculated based on the number of received packets in the monitoring period Tchk, the fluctuation of the band is detected at time t2 delayed by Tchk at the maximum. At this point, assuming that an IP packet is transmitted to SN2 on the transmission side, it takes time (Tcan) for SN2 to be received in band B2 until the packet staying on the route is eliminated. Become.

Here, SN2 based on transmission characteristics is
SN2 = tan (θ) × Tchk + Sdly + SN1
It is represented by On the other hand, SN2 based on the band B2 is
SN2 = tan (γ) × (Tchk + Tcan) + SN1
It becomes. Therefore, the time (Tcan) required to cancel the stay from the time t2 is
Tcan = [{tan (θ) × Tchk + Sdly} / tan (γ)] − Tchk
Therefore, if the current time is t3, the remaining cancellation time (Tsty) is
Tsty = Tcan + t2-t3
It becomes.

  The elimination time (Tsty) is calculated for each route according to the priority order, and the route with the smallest elimination time is selected. In addition, when the transmission band is updated a plurality of times as the allowable bandwidth of the path is changed, the cancellation time is estimated by multiplexing the number of times of update depending on the detection timing.

  Furthermore, in the present embodiment, after transmitting the transmission band control Msg, when receiving the transmission band control Msg for the route that transmitted the transmission band control Msg, the transmission band control Msg transmitted first reaches the other party. The possibility of staying on the route is high. For this reason, re-transmission of the transmission band control Msg is tried on another route.

  FIG. 6 is a flowchart showing the re-transmission processing of the transmission band control Msg. First, when transmission band control Msg from the other party (here, MN300) is received (step S21), transmission band control is performed within a predetermined period (for example, 1000 ms) from the path targeted for transmission band control by the received transmission band control Msg. It is determined whether or not Msg has been transmitted (step S22). If transmission has been performed, the optimum route is selected according to FIG. 4 using the route excluding the transmission route (step S23), and transmission band control Msg is again performed. Is generated (step S24), and the generated transmission band control Msg is transmitted from the newly selected route (step S25).

(Operation of communication system)
Next, the operation of an example of the above-described communication system will be described with reference to FIG. FIG. 7 is a communication sequence diagram executed between the switching server 100 and the MN 300. As shown in FIG. 7, in step S30, the switching server 100 and the MN 300 transmit and receive VoIP packets via the wireless IP network 10A (master route) and the Internet 20. The VoIP packet is transmitted / received along with a voice call between the MN 300 and the IP telephone terminal 40 (see FIG. 1).

  Specifically, the MN 300 encapsulates the payload including the IP address assigned to the IP telephone terminal 40 and the home IP address AH, and uses the care-of IP address A1 as the source address (FIG. 3A). Send).

  The switching server 100 encapsulates the VoIP packet transmitted from the IP telephone terminal 40 and transmits an IP packet having the care-of IP address A1 as a destination address.

  In the figure, a “black square” is marked on the network through which the VoIP packet passes (hereinafter the same). In step S30, all VoIP packets pass through the wireless IP network 10A (master route) and the Internet 20.

  In this state, in the switching server 100, the transmission bandwidth calculation means 109 calculates the upstream transmission bandwidth of the wireless IP network 10A as 100%. Similarly, in the MN 300, the transmission band calculation unit 309 calculates the transmission band in the downlink direction of the wireless IP network 10A as 100%.

  Thereafter, in step S40A, when the switching server 100 detects the narrowing of the upstream transmission band of the wireless IP network 10A, a transmission band control Msg (first upstream transmission band control Msg) indicating that is generated. Then, it is transmitted to the MN 300 via the wireless IP network 10A (step S50A).

  Similarly, in step S40B, when the MN 300 detects that the downlink transmission band of the wireless IP network 10A is narrowed, a transmission band control Msg (first downlink transmission band control Msg) indicating that is generated. And transmitted to the switching server 100 via the wireless IP network 10A (step S50B).

  In step S60A, the switching server 100 controls the transmission band of the VoIP packet to be transmitted to the wireless IP network 10A based on the first downlink transmission band control Msg received from the MN 300, and sends the VoIP packet to the wireless IP network 10A. Send.

  In step S60B, the MN 300 controls the transmission bandwidth of the VoIP packet to be transmitted to the wireless IP network 10A based on the first uplink transmission bandwidth control Msg received from the switching server 100, and sends the VoIP packet to the wireless IP network 10A. Send.

  In step S70A, the switching server 100 calculates the transmission band of the VoIP packet to be transmitted to the wireless IP network 10B that is the slave path, based on the first downlink transmission band control Msg received from the MN 300, and the calculated transmission band The VoIP packet is transmitted to the wireless IP network 10B.

  In step S70B, the MN 300 calculates the transmission band of the VoIP packet to be transmitted to the wireless IP network 10B that is the slave path based on the first uplink transmission band control Msg received from the switching server 100, and the calculated transmission band The VoIP packet is transmitted to the wireless IP network 10B.

  Through these Step S70A and Step S70B, the VoIP packet passes through the wireless IP network 10B and the Internet 20. That is, the bandwidth that is insufficient in the wireless IP network 10A is supplemented by the wireless IP network 10B.

  Thereafter, for the wireless IP network 10B, the switching server 100 detects narrowing of the upstream transmission band of the wireless IP network 10B based on the received packet, and if narrowing is detected, that fact The second uplink transmission band control Msg is generated, and the second uplink transmission band control Msg is transmitted to the MN 300 from the optimum transmission route according to the flowcharts shown in FIGS.

  Similarly, for the wireless IP network 10B, the MN 300 detects the narrowing of the transmission band in the downstream direction of the wireless IP network 10B based on the received packet, and indicates that when the narrowing of the bandwidth is detected. The second downlink transmission band control Msg is generated, and this second downlink transmission band control Msg is similarly transmitted to the switching server 100 from the optimum transmission route according to the flowcharts shown in FIGS.

  Further, for the wireless IP network 10A that is the master route, the switching server 100 detects the narrowing of the upstream transmission band of the wireless IP network 10A based on the received packet, and the narrowing of the bandwidth is detected. In some cases, a first uplink transmission band control Msg indicating that fact is generated, and this first uplink transmission band control Msg is similarly determined from the optimum transmission path according to the flowcharts shown in FIGS. To send.

  Similarly, for the wireless IP network 10A, the MN 300 detects the narrowing of the transmission band in the downstream direction of the wireless IP network 10A based on the received packet, and indicates that when the narrowing of the bandwidth is detected. The first downlink transmission band control Msg is generated, and the first downlink transmission band control Msg is similarly sent to the switching server 100 from the optimum transmission route according to the flowcharts shown in FIGS.

  Thereby, in the switching server 100, based on the first downlink transmission band control Msg or the second downlink transmission band control Msg received from the MN 300, the VoIP packet received from the IP telephone terminal 40 is transmitted to the wireless IP network 10A and the wireless IP. Based on the first uplink transmission band control Msg or the second uplink transmission band control Msg received from the switching server 100, the MN packet is distributed to the network 10B, and the VoIP packet is transmitted to the wireless IP network 10A and the wireless IP network. 10B is distributed and transmitted.

  As described above, according to the switching server 100 of the present embodiment, the packets received via the wireless IP networks 10A and 10B, respectively, and the narrowing of the downstream transmission band of the wireless IP networks 10A and 10B are respectively shown. Based on the first downlink transmission band control Msg and the second downlink transmission band control Msg, the bandwidth state of the wireless IP networks 10A and 10B is monitored, and based on the monitoring result, the uplink direction of the wireless IP networks 10A and 10B Since the optimum route for transmitting the first uplink transmission band control Msg and the second uplink transmission band control Msg indicating the narrowing of the transmission band is selected, the first uplink transmission band control Msg and the first uplink transmission band control Msg and the second uplink transmission band control Msg are selected. 2 Upstream transmission bandwidth control Msg can always be sent to MN 300 with minimum arrival time, Retention of packets within a line communication path can be minimized. Therefore, it is possible to effectively reduce the number of packets discarded without being reproduced due to the arrival time delay due to fluctuations in the allowable bandwidth, and supplementing the bandwidth shortage in the wireless IP network 10A using the wireless IP network 10B. , The VoIP packet can be reliably transmitted to the MN 300.

  Similarly, according to the MN 300 of the present embodiment, the packets received via the wireless IP networks 10A and 10B, respectively, and the first upstream direction indicating the narrowing of the upstream transmission band of the wireless IP networks 10A and 10B, respectively. Based on the transmission bandwidth control Msg and the second upstream transmission bandwidth control Msg, the bandwidth state of the wireless IP networks 10A and 10B is monitored, and based on the monitoring result, the downlink transmission bandwidth of the wireless IP networks 10A and 10B is narrowed. Since the optimum route for transmitting the first downlink transmission band control Msg and the second downlink transmission band control Msg indicating the banding is selected, the first downlink transmission band control Msg and the second downlink transmission are selected. The bandwidth control Msg can always be sent to the switching server 100 with the minimum arrival time, and wireless communication Retention of packets in the path can be minimized. Therefore, it is possible to effectively reduce the number of packets discarded without being reproduced due to the arrival time delay due to fluctuations in the allowable bandwidth, and supplementing the bandwidth shortage in the wireless IP network 10A using the wireless IP network 10B. , The VoIP packet can be reliably transmitted to the switching server 100.

  Moreover, in the switching server 100 and the MN 300, the transmission band control Msg indicating the narrowing of the transmission band is generated and transmitted to the transmission side for each of the uplink and downlink directions of the wireless IP networks 10A and 10B. By adapting to the communication system of the wireless IP networks 10A and 10B, it is possible to detect the band fluctuation in real time and control the transmission band. Therefore, in a real-time application such as VoIP, the number of discarded packets can be effectively reduced without being reproduced due to a delay in arrival time due to fluctuations in allowable bandwidth.

  In addition, this invention is not limited to the said embodiment, Many deformation | transformation or a change is possible. For example, the communication system 1 includes the wireless IP network 10A and the wireless IP network 10B. However, more wireless IP networks may be used. In the above-described embodiment, the insufficient transmission band is supplemented in both the upstream direction and the downstream direction. However, the transmission band in the upstream direction or the downstream direction may be supplemented. Further, as a transmission route of the transmission band control Msg, if there is an available wireless communication route that can be used, this route can also be used.

  In the above embodiment, the transmission band control by the transmission band control Msg is not limited to the corresponding wireless path, but is performed simultaneously so as to supplement other wireless paths, or has another wireless path. In this case, the wireless path can be newly used to supplement the narrow band. For example, when the switching server 100 narrows the transmission band of a packet to be transmitted to the wireless IP network 10B based on the second downlink transmission band control Msg from the MN 300, the wireless is made to compensate for the narrow band. It is also possible to control the transmission band so as to increase the band of the packet transmitted to the IP network 10A, or to further supplement the narrow band with another wireless path.

1 is an overall schematic configuration diagram of a communication system according to an embodiment of the present invention. It is a functional block block diagram of the switching server and MN shown in FIG. It is a block diagram of the IP packet which concerns on embodiment shown in FIG. It is a flowchart which shows the route selection process of the transmission band control Msg by embodiment shown in FIG. It is a figure for demonstrating the residence time of the packet by the fluctuation | variation of a transmission band. It is a flowchart which shows the re-transmission process of the transmission band control Msg by embodiment shown in FIG. It is a communication sequence diagram of an example performed between the switching server and MN by embodiment shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication system 10A, 10B Wireless IP network 20 Internet 40 IP telephone terminal
DESCRIPTION OF SYMBOLS 100 Switching server 101Rx, 103Rx, 105Rx Reception interface part 101Tx, 103Tx, 105Tx Transmission interface part 107 Reception packet monitoring means 109 Transmission band calculation means 111 Transmission band control Msg analysis means 113 Packet transmission path control means 115 Control Msg transmission path control means 117 Transmission route selection means 300 Mobile node (MN)
301Rx, 303Rx reception interface unit 301Tx, 303Tx transmission interface unit 305 application (application) processing unit 307 reception packet monitoring unit 309 transmission band calculation unit 311 transmission band control Msg analysis unit 313 packet transmission path control unit 315 control Msg transmission path control unit 317 Transmission route selection means

Claims (10)

A plurality of different wireless communication paths can be used with the wireless communication device, and the bandwidth that is lacking in one wireless communication path is used for the required bandwidth of the application having real-time characteristics to be used. A communication control device for controlling communication between the wireless communication device and a communication destination,
Based on a packet received via the one wireless communication path, first uplink transmission band control information indicating narrowing of a transmission band of a packet transmitted from the wireless communication apparatus to the one wireless communication path is generated. 1 uplink transmission band control information generating means;
Based on a packet received via the other wireless communication path, second uplink transmission band control information indicating the narrowing of the transmission band of the packet transmitted from the wireless communication apparatus to the other wireless communication path is generated. 2 uplink transmission band control information generating means;
An uplink for selecting an optimum transmission path for transmitting the first uplink transmission band control information or the second uplink transmission band control information to the radio communication device based on the band states of the plurality of radio communication paths Direction transmission bandwidth control information transmission path control means;
A communication control device comprising:   The uplink transmission band control information transmission path control means is configured to fix the first uplink transmission band control information or the second uplink transmission band control information out of the one radio communication path and the other radio communication path. 2. The communication control apparatus according to claim 1, wherein a wireless communication path that has not been transmitted for a period is selected as an optimum transmission path.   The uplink transmission band control information transmission path control means, the radio communication path having the maximum allowable band among the one radio communication path and the other radio communication path, the first uplink transmission band control information or The communication control apparatus according to claim 1, wherein the communication control apparatus is selected as an optimum transmission path of the second uplink transmission band control information.   The uplink transmission band control information transmission route control means, the wireless communication route of the transmission packet from the wireless communication device is the shortest of the retention time of the transmission packet from the one wireless communication route and the other wireless communication route, The communication control device according to claim 1, wherein the communication control device is selected as an optimum transmission path of the first uplink transmission band control information or the second uplink transmission band control information. A plurality of different wireless communication paths can be used with the communication control device, and other wireless communication paths can be used for the bandwidth required by one wireless communication path for the requested bandwidth of the application that has real-time characteristics. And a wireless communication device that wirelessly communicates with a communication destination via the communication control device,
Based on a packet received via the one wireless communication path, first downlink transmission band control information indicating narrowing of a transmission band of a packet transmitted from the communication control device to the one wireless communication path is generated. 1 downlink transmission band control information generating means;
Generating second downlink transmission band control information indicating narrowing of the transmission band of a packet transmitted from the communication control device to the other wireless communication path based on a packet received via the other wireless communication path; 2 downlink transmission band control information generating means;
A downlink that selects an optimum transmission path for transmitting the first downlink transmission band control information or the second downlink transmission band control information to the communication control device based on the band state of the plurality of wireless communication paths. Direction transmission bandwidth control information transmission path control means;
A wireless communication apparatus comprising:   The downlink transmission band control information transmission path control means is configured to keep the first downlink transmission band control information or the second downlink transmission band control information constant among the one wireless communication path and the other wireless communication path. 6. The wireless communication apparatus according to claim 5, wherein a wireless communication path that has not been transmitted for a period is selected as an optimal transmission path.   The downlink transmission band control information transmission path control means is configured to select a radio communication path having a maximum allowable band from the one radio communication path and the other radio communication path as the first downlink transmission band control information or The wireless communication apparatus according to claim 5 or 6, wherein the wireless communication apparatus is selected as an optimum transmission path of the second downlink transmission band control information.   The downlink transmission band control information transmission route control means, the wireless communication route of the transmission packet from the communication control device is shortest among the one wireless communication route and the other wireless communication route, 6. The radio communication apparatus according to claim 5, wherein the wireless communication apparatus is selected as an optimum transmission path of the first downlink transmission band control information or the second downlink transmission band control information. A plurality of different wireless communication paths can be used with the wireless communication device, and the bandwidth that is lacking in one wireless communication path is used for the required bandwidth of the application having real-time characteristics to be used. A communication control method for controlling communication between the wireless communication device and a communication destination,
Generating first uplink transmission band control information indicating narrowing of a transmission band of a packet transmitted from the wireless communication apparatus to the one wireless communication path based on a packet received via the one wireless communication path; When,
Generating second uplink transmission band control information indicating narrowing of a transmission band of a packet transmitted from the wireless communication apparatus to the other wireless communication path based on a packet received via the other wireless communication path; When,
Selecting an optimum transmission path for transmitting the first uplink transmission band control information or the second uplink transmission band control information to the radio communication apparatus based on the band states of the plurality of radio communication paths. When,
The communication control method characterized by including. A plurality of different wireless communication paths can be used with the communication control device, and other wireless communication paths can be used for the bandwidth required by one wireless communication path for the requested bandwidth of the application that has real-time characteristics. And a wireless communication method for wirelessly communicating with a communication destination via the communication control device,
Generating first downlink transmission band control information indicating narrowing of a transmission band of a packet transmitted from the communication control apparatus to the one wireless communication path based on a packet received via the one wireless communication path; When,
Generating second downlink transmission band control information indicating narrowing of a transmission band of a packet transmitted from the communication control device to the other wireless communication path based on a packet received via the other wireless communication path When,
Selecting an optimal transmission path for transmitting the first downlink transmission band control information or the second downlink transmission band control information to the communication control device based on a band state of the plurality of wireless communication paths. When,
A wireless communication method comprising:

Images